If, after having asked for help, you suspect that you have found a bug in Cassandra, you should report it by opening a ticket through the Apache Cassandra JIRA. Please provide as much details as you can on your problem, and don’t forget to indicate which version of Cassandra you are running and on which environment.
To create a JIRA account, please request it on the #cassandra or #cassandra-dev channels on ASF Slack, or on the user or dev mailing list.
Further details on how to contribute can be found at our Contributing to Cassandra section. Please note that the source of this documentation is part of the Cassandra git repository and hence contributions to the documentation should follow the same path.